It's harder to protect her when he doesn't know what happened to her. Who attacked her, why they chose her... If it was about power, they would have attacked him. Killed both of them.

When she talks about waking up, he wonders if she thinks he woke up when she did. After a moment, though, her voice really just tells him that she's trying to figure this out... Like she was trying to understand his memories.

"Yeah..." His voice isn't steady. "But...I..." didn't die "It couldn't..." have been long after she died. Stubbornly, he finishes: "I woke up pretty quickly... Like it was a weak spell or something..."